While reading the "Horizon 2010" report, I came across a reference to Worldmapper. Worldmapper is a "visualization too that redraws maps based on the data being displayed. For instance, on a world map showing population, countries with more people swell while those with fewer people shrink." (Horizon 2010 report, New Media Consortium and Educause Learning Initiative, 2009.)
I poked around on the website and, it's pretty interesting. For example, the map depicting deaths caused by infectious and parasitic diseases, Africa and the Indian subcontinent are giant bulges and Europe and North America appear almost emaciated. These maps are very interesting and could be the source of some enlightening discussions with your classes.